JP4641369B2 - Partially built soil cement composite pile - Google Patents
Partially built soil cement composite pile Download PDFInfo
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- JP4641369B2 JP4641369B2 JP2001276982A JP2001276982A JP4641369B2 JP 4641369 B2 JP4641369 B2 JP 4641369B2 JP 2001276982 A JP2001276982 A JP 2001276982A JP 2001276982 A JP2001276982 A JP 2001276982A JP 4641369 B2 JP4641369 B2 JP 4641369B2
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- pile
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- soil cement
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Description
【０００１】
【発明の属する技術分野】
本発明は、土木、建築構造物の基礎杭に関し、特に、ソイルセメント柱体の中にらせん状羽根を有する杭を挿入してなるソイルセメント合成杭に関する。
【０００２】
【従来の技術】
従来、らせん翼を設けた杭を回転埋設する工法や、地盤改良によって造成されたソイルセメント柱体の中に、補強部材として鋼管等を挿入し、杭とする工法がある。このような工法の代表的な例としては特開昭６０−２３８５１５号公報に開示された技術（第１公知例）や、特許第２７３１８０６号の技術（第２公知例）がある。
【０００３】
第１公知例の技術は、土質固化ミルクを充填しながら杭埋設孔を掘削し、杭埋設孔の下端部を拡大掘削した後、少なくとも下端部にらせん翼を設けた基礎杭を回転しながら貫入させるものである。
また、第２公知例の技術は、地盤とセメントミルク等の固化材を攪拌して削孔内を所定深度までソイルセメント化し、削孔底部を、そこまで注入した固化材よりも固化後の圧縮強度が大きくなる固化材で充満させ、掘削・攪拌ロッドを引き上げて内周面の下部に固化材との付着力を向上させるための突起を有し且つ少なくとも１枚のらせん翼が下端部に設けられている鋼管をソイルセメント化した削孔内に挿入するものである。
【０００４】
【発明が解決しようとする課題】
本発明は、より経済合理性の高いソイルセメント合成杭の提供を目的とする。
【０００５】
【課題を解決するための手段】
本発明者は、ソイルセメント柱体は、全体が一体でなくとも、らせん状羽根が収まる部分のみに築造すれば十分であることを見出し、本発明に到達した。
すなわち、本発明は、下記の通りである。
１．最下端部にらせん状羽根を有し、杭頭部近傍に少なくとも１枚のらせん状羽根を有し、中間部に複数枚のらせん状羽根を有するらせん状羽根付杭を、地盤中に該らせん状羽根部にのみ築造される一連のソイルセメント柱体に挿入して形成されることを特徴とする部分築造ソイルセメント合成杭。
【０００６】
２．らせん状羽根付杭本体の直径をｄ、らせん状羽根の直径をＤ、ソイルセメント柱体の直径をＤｃとしたとき、前記らせん状羽根の直径Ｄの範囲が杭本体の直径ｄの１．５倍乃至３．０倍であり、ソイルセメント柱体の直径Ｄｃの範囲がらせん状羽根の直径Ｄの１．２倍乃至３．０倍であることを特徴とする１．に記載の部分築造ソイルセメント合成杭。
３．らせん状羽根付杭本体の中空部にセメントミルク又はモルタル或いはコンクリートが充填されていることを特徴とする１．乃至２．のいずれかに記載の部分築造ソイルセメント合成杭。
【０００７】
４．杭頭部近傍のらせん状羽根の直径が、その他の部分の直径より大きいことを特徴とする１．乃至３．のいずれかに記載の部分築造ソイルセメント合成杭。
５．らせん状羽根付杭の杭頭部近傍のソイルセメント柱体の直径が、その他の部分の直径より大きいことを特徴とする１．乃至４．に記載の部分築造ソイルセメント合成杭。
６．とセメント等の固化材を、らせん状羽根部が収まる部分にのみ部分的に供給、攪拌混合し、築造した一連のソイルセメント柱体に、最下端部にらせん状羽根を有し、杭頭部近傍に少なくとも１枚のらせん状羽根を有し、中間部に複数枚のらせん状羽根を有するらせん状羽根付杭を、挿入することを特徴とする請求項１に記載の部分築造ソイルセメント合成杭の造成方法。
【０００８】
【発明の実施の形態】
以下、図により本発明のソイルセメント合成杭の実施例を説明する。
図１(a)〜(e)は、本発明の一実施例の施工工程の概要を示す地盤断面図である。はじめに、図１(a)に示すように掘削ビットのノズルからセメント等の固化材をジェット状に噴射することにより地盤と固化材を混合攪拌する。あるいは機械式深層混合処理工法によって地盤と固化材を混合する。混合攪拌装置は、先端に掘削爪を有し、逆転させると攪拌羽根が開き、拡大掘削できる機構を有しているものを用いるのが好適である。
【０００９】
所定の深度まで混合攪拌を行ったのち、図１(b)、図１(c)に示すように、ソイルセメントコラムを部分的に造成する。
次に、図１（d）に示すように、最下端部にらせん状羽根を有し、中間部に複数枚のらせん状羽根を有している杭を、ねじり込みにより挿入する。最終的に図１（e）のようなソイルセメント合成杭が造成される。らせん状羽根付杭は、一本で用いても良いし、溶接、ネジ継手などの接続手段により複数本接続して継杭として用いても良い。また、杭の挿入は必ずしもねじり込む必要はなく、押し込みによって挿入することも可能である。
【００１０】
図２は、杭本体の直径をｄ、らせん状羽根の直径をＤ、ソイルセメント改良柱体の直径をＤｃとしたときに、その関係の一例を図示したものである。これら寸法の好ましい範囲は、前記らせん状羽根の直径Ｄの範囲が杭本体の直径ｄの１．５倍乃至３．０倍であり、ソイルセメント柱体の直径Ｄｃの範囲がらせん状羽根の直径Ｄの１．２倍乃至３．０倍である。
らせん状羽根の直径Ｄが杭本体の直径ｄの１．５倍未満の場合、荷重は杭本体かららせん状羽根を介してソイルセメント柱体に分散されるが、その効果は十分とは言いがたい。特に、らせん状羽根とソイルセメント柱体との付着面積が少なくなるため、杭本体とソイルセメント柱体の一体効果が減少し易い。
【００１１】
らせん状羽根の直径Ｄが杭本体の直径ｄの３．０倍を超えると、らせん状羽根に発生する曲げ応力が大きくなり、この大きな曲げ応力を杭本体に伝達させるために、らせん状羽根の厚さを厚くする必要が生じる。更に、らせん状羽根と杭本体の本体との溶接部分の性能を確保するために、十分な溶接を行うことが必要となり高価になり易い。
【００１２】
【発明の効果】
本発明のソイルセメント合成杭は、前述のような構成よりなるので、ソイルセメント柱状体とらせん状羽根付杭が一体化し、らせん状羽根から荷重が滑らかにソイルセメント柱状体に分散される。また、ソイルセメント柱体が部分築造の一連の短長柱体からなるため、セメント等固化材の使用量が少なくて済む。さらに、施工速度も上がり、排出残土も少なくなる。
【図面の簡単な説明】
【図１】図１は、本発明の一実施例の施工工程の概要を示す地盤断面図である。
【図２】図２は、らせん状羽根付杭本体の直径をｄ、らせん状羽根の直径をＤ、ソイルセメント柱体の直径をＤｃとしたとき、これらの関係の一例を示した図であり、（ａ）は正面図、（ｂ）は（ａ）のＡＡ’線断面図である。
【図３】一連のソイルセメント柱体に、らせん状羽根が配置されるように、らせん状羽根付杭が挿入された部分築造ソイルセメント合成杭の完成状態を示した片面断面図である。
【符号の説明】
１ 地盤
２ らせん状羽根付杭
３ ソイルセメント柱体
４ らせん状羽根
５ ソイルセメント柱体造成装置
６ フーチング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foundation pile for civil engineering and building structures, and more particularly to a soil cement synthetic pile formed by inserting a pile having helical blades into a soil cement pillar.
[0002]
[Prior art]
Conventionally, there are a method of rotating and embedding a pile provided with a spiral blade, and a method of making a pile by inserting a steel pipe or the like as a reinforcing member into a soil cement column formed by ground improvement. As a typical example of such a construction method, there is a technique (first known example) disclosed in Japanese Patent Laid-Open No. 60-238515 and a technique disclosed in Japanese Patent No. 2731806 (second known example).
[0003]
The technology of the first known example is excavating a pile burial hole while filling with soil solidified milk, expanding the lower end of the pile burial hole, and then penetrating the foundation pile with spiral wings at least at the lower end It is something to be made.
The technology of the second known example is that the ground and solidified material such as cement milk are agitated to form soil cement to a predetermined depth in the hole, and the bottom of the hole is compressed after solidification rather than the solidified material injected to that depth. Filled with solidified material that increases strength, and has a protrusion for raising the excavation and stirring rod to improve the adhesion to the solidified material at the bottom of the inner peripheral surface, and at least one spiral blade is provided at the lower end The steel pipe is inserted into a hole drilled into soil cement.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a soil cement synthetic pile with higher economic rationality.
[0005]
[Means for Solving the Problems]
The present inventor has found that it is sufficient to construct the soil cement pillar only in a portion where the spiral blades can be accommodated, even if it is not integrated as a whole.
That is, the present invention is as follows.
1. Spiral blades with spiral blades at the lowest end, at least one spiral blade near the pile head, and multiple spiral blades with multiple spiral blades in the middle. Partially built soil cement composite piles, characterized in that they are formed by inserting into a series of soil cement pillars built only on the blades.
[0006]
2. When the diameter of the pile body with the spiral blade is d, the diameter of the spiral blade is D, and the diameter of the soil cement column is Dc, the range of the diameter D of the spiral blade is 1.5 of the diameter d of the pile body. 1 to 3.0 times, and the range of the diameter Dc of the soil cement pillar is 1.2 to 3.0 times the diameter D of the spiral blade. Partially built soil cement synthetic piles as described in.
3. 1. Cement milk, mortar, or concrete is filled in the hollow part of the pile body with spiral blades. To 2. A partially built soil cement synthetic pile according to any one of the above.
[0007]
4). 1. The diameter of the spiral blade near the pile head is larger than the diameter of other parts. To 3. A partially built soil cement synthetic pile according to any one of the above.
5. 1. The diameter of the soil cement column near the pile head of the spiral bladed pile is larger than the diameter of other parts. To 4. Partially built soil cement synthetic piles as described in.
6). A series of soil cement pillars that are partially supplied, stirred and mixed only in the part where the spiral blade part fits, and the solidified material such as cement, etc. The partially built soil cement synthetic pile according to claim 1, wherein a pile with a spiral blade having at least one spiral blade in the vicinity and a plurality of spiral blades in the middle is inserted. How to build.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the Example of the soil cement synthetic | combination pile of this invention is demonstrated with a figure.
1 (a) to 1 (e) are ground sectional views showing an outline of a construction process according to an embodiment of the present invention. First, as shown in FIG. 1 (a), the ground and the solidified material are mixed and agitated by jetting a solidified material such as cement in a jet form from the nozzle of the excavation bit. Alternatively, the ground and the solidified material are mixed by a mechanical deep mixing method. It is preferable to use a mixing and stirring device having a drilling claw at the tip and having a mechanism capable of opening the stirring blades and expanding the drilling when reversed.
[0009]
After mixing and stirring to a predetermined depth, a soil cement column is partially formed as shown in FIGS. 1 (b) and 1 (c).
Next, as shown in FIG.1 (d), the pile which has a helical blade | wing in the lowest end part and has several helical blade | wings in the intermediate part is inserted by twisting. Finally, a soil cement composite pile as shown in FIG. One spiral bladed pile may be used, or a plurality of spiral bladed piles may be connected as a joint pile by connecting means such as welding or a threaded joint. Moreover, it is not always necessary to twist the pile, and the pile can be inserted by pushing.
[0010]
FIG. 2 shows an example of the relationship when the diameter of the pile body is d, the diameter of the spiral blade is D, and the diameter of the soil cement improved column is Dc. A preferable range of these dimensions is that the range of the diameter D of the spiral blade is 1.5 to 3.0 times the diameter d of the pile body, and the range of the diameter Dc of the soil cement column is the diameter of the spiral blade. It is 1.2 to 3.0 times D.
When the diameter D of the spiral blade is less than 1.5 times the diameter d of the pile body, the load is distributed from the pile body to the soil cement pillar through the spiral blade, but the effect is not sufficient. I want. In particular, since the adhesion area between the spiral blade and the soil cement pillar is reduced, the integrated effect of the pile body and the soil cement pillar is likely to be reduced.
[0011]
When the diameter D of the spiral blade exceeds 3.0 times the diameter d of the pile body, the bending stress generated in the spiral blade increases, and in order to transmit this large bending stress to the pile body, It is necessary to increase the thickness. Furthermore, in order to ensure the performance of the welded portion between the spiral blade and the main body of the pile body, it is necessary to perform sufficient welding, which tends to be expensive.
[0012]
【The invention's effect】
Since the soil cement synthetic pile of the present invention has the above-described configuration, the soil cement columnar body and the spiral bladed pile are integrated, and the load is smoothly dispersed from the spiral blade to the soil cement columnar body. Further, since the soil cement column body is composed of a series of short and long columns partially built, the amount of solidifying material such as cement can be reduced. In addition, the construction speed increases and the amount of residual soil is reduced.
[Brief description of the drawings]
FIG. 1 is a ground cross-sectional view showing an outline of a construction process according to an embodiment of the present invention.
FIG. 2 is a diagram showing an example of the relationship when the diameter of the pile body with a spiral blade is d, the diameter of the spiral blade is D, and the diameter of the soil cement pillar is Dc. (A) is a front view, (b) is an AA 'line sectional view of (a).
FIG. 3 is a one-side cross-sectional view showing a completed state of a partially built soil cement composite pile in which a spiral bladed pile is inserted so that a spiral blade is arranged in a series of soil cement pillars.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001276982A JP4641369B2 (en) | 2001-09-12 | 2001-09-12 | Partially built soil cement composite pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001276982A JP4641369B2 (en) | 2001-09-12 | 2001-09-12 | Partially built soil cement composite pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003082658A JP2003082658A (en) | 2003-03-19 |
| JP4641369B2 true JP4641369B2 (en) | 2011-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001276982A Expired - Lifetime JP4641369B2 (en) | 2001-09-12 | 2001-09-12 | Partially built soil cement composite pile |
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| Country | Link |
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| JP (1) | JP4641369B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5936996B2 (en) * | 2012-11-30 | 2016-06-22 | 千代田工営株式会社 | Rooting construction method of rotary intrusion pile |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047118A (en) * | 1983-08-24 | 1985-03-14 | Asahi Chem Ind Co Ltd | Low-pollution piling work |
| JPS6225612A (en) * | 1985-07-26 | 1987-02-03 | Eijiro Kurahashi | Pile |
| JPH1136295A (en) * | 1997-07-24 | 1999-02-09 | Nkk Corp | Screw type steel pipe pile |
| JPH11247189A (en) * | 1998-03-03 | 1999-09-14 | Asahi Chem Ind Co Ltd | Spliced pile structure made of steel pipe |
| JP2000096560A (en) * | 1998-09-17 | 2000-04-04 | Nkk Corp | Screwing-type steel pipe pile and its execution |
| JP2001098541A (en) * | 1999-09-29 | 2001-04-10 | Kubota Corp | Steel pipe soil cement composite pile, and construction method and device |
-
2001
- 2001-09-12 JP JP2001276982A patent/JP4641369B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047118A (en) * | 1983-08-24 | 1985-03-14 | Asahi Chem Ind Co Ltd | Low-pollution piling work |
| JPS6225612A (en) * | 1985-07-26 | 1987-02-03 | Eijiro Kurahashi | Pile |
| JPH1136295A (en) * | 1997-07-24 | 1999-02-09 | Nkk Corp | Screw type steel pipe pile |
| JPH11247189A (en) * | 1998-03-03 | 1999-09-14 | Asahi Chem Ind Co Ltd | Spliced pile structure made of steel pipe |
| JP2000096560A (en) * | 1998-09-17 | 2000-04-04 | Nkk Corp | Screwing-type steel pipe pile and its execution |
| JP2001098541A (en) * | 1999-09-29 | 2001-04-10 | Kubota Corp | Steel pipe soil cement composite pile, and construction method and device |
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| Publication number | Publication date |
|---|---|
| JP2003082658A (en) | 2003-03-19 |
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